Hello,
you might add a "Huff and Puff" stabiliser.
It is a very good and simple system to lock a vfo in 10Hz or larger steps.
The original is made by PA0KSB.
Just google and read..
Johan PE1AEQ

"Steven Fritts" schreef in bericht
...
Hello All,
I picked up a really nice working Swan 350 at a hamfest this past
weekend. I bought it for nostalgic reasons as it was the kind of rig
my dad bought for me in 1965. I need info on how to fix the infamous
"Swan drift problem". Anyone have any websites I can go to get mods
for this rig including the drift fix?
Any help will be appreciated!

Steve W4SEF